Is creating an instance of a class equivalent to creating a variable?

Question

Java

Let's say. There is a certain class, I want to create an instance of this class. I write
man superman = new man();
After all, in fact, I create a link to the newly created variable (structure (class)).
It turns out something like
int x = new int(); Looks a bit original...
Why can't I just write "man superman;" ? So it is clear that a new instance of the man class is being created.
Or this entry "man superman = new man();" Are there any interesting features that I don't understand yet? Maybe Java gurus will tell you how else you can use the class description and create class instances.

Answer 1

Look:
You have two Superman figurines.
man superman1 = new man();
man superman2 = new man();
The variable superman1 refers to the first figurine, superman2 to the second figurine.
man superman3 = superman1;
Now, we have a third variable that refers to the first figurine.
Total: 3 variables, 2 objects.
Why do we write int x = 0; not int x = new int(0);
Because int is an integer digit and no properties/arguments can be passed to it. One is one, two is two.
man superman1 = new man(run fast, invincible);
man superman2 = new man(jump far, immortal);
int x = new int(0); that's it, the int type has run out of super abilities, only a number and that's it.
String str = new String("String"); just a line, nothing else.

Answer 2

Why can't I just write "man superman;" ?

Because there are about a million cases where you need to declare a variable but not create an instance.

Answer 3

Such syntax, but no sugar was invented for it. It remains either to accept, or to come up with a Java preprocessor for sugar. Your example with "man superman;" more like sugar.

Answer 4

As far as I understand you are new to Java.
I recommend reading this article to get started.
And in general, it’s better to master 4 chapters from this book (you can easily find it on the net). It’s impossible to explain it right off the bat.
In Java Object object;, this is just a reference. You simply declare a variable. To assign an object to it in the Heap (a special data structure that stores all JVM objects), we use object = new Object();
this approach to dynamically change objects, use polymorphism, lazy initialization, etc. d.
Ps
int x = new int(); cannot be written because int is a primitive type.